From 07f078640ae742ca7676f5f6dcbc844698b4b446 Mon Sep 17 00:00:00 2001
From: Axel Huebl <axel.huebl@plasma.ninja>
Date: Thu, 2 Feb 2023 17:41:17 -0800
Subject: [PATCH] CopyBuffer: Skip Zero Elements

Avoid operating on invalid memory in `CopyBuffer` if the operation
is zero elements.
---
 source/adios2/helper/adiosMemory.inl | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/source/adios2/helper/adiosMemory.inl b/source/adios2/helper/adiosMemory.inl
index 41a5d765aa..556d820ccd 100644
--- a/source/adios2/helper/adiosMemory.inl
+++ b/source/adios2/helper/adiosMemory.inl
@@ -146,6 +146,11 @@ template <class T>
 void CopyToBuffer(std::vector<char> &buffer, size_t &position, const T *source,
                   const size_t elements) noexcept
 {
+    if (elements == 0)
+    {
+        return;
+    }
+
     const char *src = reinterpret_cast<const char *>(source);
     std::copy(src, src + elements * sizeof(T), buffer.begin() + position);
     position += elements * sizeof(T);